"Phiten Neck and Shoulder Support Pillow for Good Sleep was jointly developed by therapists to help you have a deeper and better sleep. Silicone balls placed inside the pillow stimulate acupuncture points, the shape hugs the head, neck, and shoulders to support a relaxed sleeping position. Material: Outer fabric: 93% polyester, 7% cotton, Lining: 93% polyester, 7% cotton, inner pocket: 100% cotton, Padding: MDI cold foam with SR material. Technology: AQUA GOLD SILICA®, AQUAGOLD® impregnated on fabric."